摘要
针对离散系统H∞设计的dhfsyn和dhinflm i两种Matlab函数,研究了二者的不同,对同一个问题,这两个函数可能得到完全不同的设计结果。对于dhfsyn函数,由于采用了双线性变换,控制器的频率特性不能保持不变,使本来应该是稳定的系统变成不稳定的。分析指出,问题的实质是个脆弱性问题,对于脆弱性系统,当采用dhfsyn函数来进行H∞设计时就会出现不稳定的设计结果。
The two Matlab functions of dhfsyn and dhinflmi for discrete H∞ design are analyzed and com- pared. It is pointed out that quite different results can be obtained even for the same problem. For the dhfsyn function, because the bilinear transformation can not preserve the frequency response of the controller after the transformation, and the resulting system may become unstable. It is a problenl of fragility. It is pointed out that if the system is fragile, then the H∞ design by using dhfsyn may lead to an unstable system,
出处
《电机与控制学报》
EI
CSCD
北大核心
2006年第5期534-536,540,共4页
Electric Machines and Control
基金
哈尔滨工程大学基础研究基金(heuft06041)
